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E. S. GILMORE. BAND SAWING MACHINE.

No. 406,396. Patented July 2, 1889.

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E. S. GILMORE. BAND SAWING MAOHINE.

No. 406,396. Patented July 2, 1889.;

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E. S. GILMORE. BAND SAWING MACHINE. No. 406.396.- Patented July 2, 1889 t Nrrnn TATES PATENT OFFICE.

ELIJAH S. GILMORE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF TVVO- THIRDS TO NATHAN \V. SPAULDING, OF SAME PLACE.

BAND SAWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 406,396, dated July 2, 1889.

Application filed June 16, 1887. Renewed November 30, 1888. Serial No. 292,381. (No model.)

To all whom it may concern:

Be it known that I, ELIJAH S. GILMORE, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful'lmprovements in Band Sawing- Maehines; and I do hereby following is a full, clear, and

declare that the exact description of my said invention, reference being had to the accompanying drawings of this specification.

, that form a part My invention relates to improvements in driving and guiding endless band-saws, and it embraces several novel points and features of mechanism for the better control of the saw in band sawing-machines, as hereinafter described, and pointed out in the claims.

The first part or feature consists of sawthey act upon the saw to throw the cutting edge forward or to draw it back from the wood while running.

In connection with this part of my invention provision is made for producing this movement of the rollers automatically by or from the saw itself, whereby the line of the cutting-edge is kept up to its work against its tendency to run back from the wood.

The improvements include also the combination, with an endless band-saw, of an indicating device to show the true vertical position of the cutting-edge and to indicate the degree of its departure from such position at all times during Work.

The followin description fully explains the nature of these said impro vements and the manner in which I construct, apply, and carry out the same, the accompanying drawings being referred to by figures and letters.

Figure 1 of the drawings is a front elevation of a band-saw, its carrying-wheels,and portions of the frame and table with my improvements applied thereto.

Fig. 2 is a side hand side of Fig. 3.

view of the saw, the carrying-wheels, and the belt and pulleys connecting one wheel with the other. Fig. 3 is a front View of the (lefiectingrollers and an adjusting mechanism. Fig. t is a side view taken from the right- Fig. 5 is a top view of the upper set of rollers, showing the manner of mounting them on the movable bracket. Fig. 6 is a perspective view of the lower set of rollers and connected mechanism for adj usting them laterally and in Vertical are. Fig. '7 is a side view ofthe two sets of rollers and the connections to move them simultaneously. Figs. 8, 9, and 10 show the indicator in front view and in detail and illustrate its operation.

A A are two pulleys fast on the shafts or centers Z) of the saw-carrying wheels 13 B, to take the belt 0, by which the two wheels are connected.

D is the saw, and E is a small pulley set in position on the frame about midway between the two carrying-wheels to take the belt and guide it away from the front or cutting portion of the saw. Suitable tension is kept on the belt by this pulley through the connection of its slide E to a weight E the slide being mounted in a grooved plate E bolted to the upright timbers of the frame, and the weight being attached by a rope running over the pulley E.

The plate G, with a dovetail slot or way, is secured to the face of the column or post of the machine as a support for the bracket H, the back plate h of which is fitted to the slot to slide up and down in this support. This movement is effected by a screw-shaft I, and by such means the upper set of deflectingrollers is adjusted up or down to regulate the distance between the two sets. The screwshaft turns in a fixed bearing la and works in a socket in the bracket, a hand-wheel K being provided on its end for turning it.

To deflect the saw to one side or the other the two sets of rollers L L L L are mounted on blocks or carriers M M, that are capable of longitudinal movement, and by properly connecting the carriers together equal and simultaneous adjustment of the top and bottom sets 10o of rollers in a lateraldirection is obtained. In addition to this lateral movement, the rollers of each set are adjustable in vertical arcs, by which they are elevated or depressed from the horizontal into a diagonal position across the face of the saw, and these two adj ustments are made separately and independently, but also simultaneously and equally in the two sets of rollers by means of the two rods R S and connecting mechanism, the general construction and arrangement of which will be understood from the detail views, Figs. 3, U, and 7.

The rollers are set on studs 771 and the block M, in which they are fixed, is capable of sliding laterally in the supports 71/ 71. The block is secured to the rod on at one end, and is provided with a stud m" at the opposite end to fit the bearing 72?. On these supports as centers the block is also capable of turning in a vertical are, and these two movements, laterally in a horizontal plane and perpendicularly in a vertical plane, are produced by moving the rod on longitudinally and by turning or partly rotating it in its bearings. These are effected from the two upright rods R S, the first one of which is free to be turned in supports on the frame, and is furnished with a hand-lever working over a locking-segment for turning it, and the other of which is capable of being moved vertically in its supports, this movement being produced by the rotation of a screw-threaded sleeve turning loosely on the rod between collars, and working through a stationary nut U on the bracket ll. The fixed collars 8* above and beneath the sleeve confine it on the shaft, and the hand-lever T serves for turning it. Such rotation of the sleeve T causes the rod to slide up or down, and by connecting the rock-shafts m by arms to this rod S its vertical movement turns the blocks M on their center. The rod R is connected directly to the rock-shaft m by means of a spline R on one and the groove V in the other at those parts of the two shafts that set against or across each other. Partial rotation of the rod It therefore moves the rod or shaft 01 longitudinally. Both set s of rollers being connected in this manner with the two upright shafts or rods, an equal movement is produced in both when the lever R or the lever T is turned. By the first-mentioned lever and its rod the two carriers M M are shifted laterally to de- Ileetthe saw, and by the other lever and red the rollers are elevated or depressed toward or from a horizontal or perpendicular plane with respect to the plane of the saw in greater or less degree to assume a horizontal position, or one diagonal with reference to the plane of rotation. By virtue of such diagonal position the rollers act upon the saw running between them to throw the cutting-edge forward or to draw it away from the wood, the saw being influenced in the one case by the elevation of the rollers and in the other by depressing them below the horizontal. rollers are faced with rubber or other suit-able material, and the stud of one roller is adjustable to and from the other stud to regulate The access the contact and grip upon the saw. The stud is fixed for this purpose in a sliding box 971?, held by set-screws 'mf.

The arms V have forked ends with pivotscrews taking in collars U on the shaft, and each collar is either fixed to the shaft by a set-screw U or it is confined and allowed to have a limited movement independent of the shaft by placing a spring S above and one below the collar. These two springs are of about equal tension, are held and their tension is regulated by movable collars t t to exert equal pressure or resistance against the collar U, or by setting them down to the point of greatest compression of the spring the collar may be practically locked to the shaft. It is also fixed in some cases by the set-screw U The office of. these springs is to afford alimited movement of the deflect in grollers independently of the rod S, so that by fixing upon the front of the roller-carrier a stop N in a position to take or be struck by the back edge of the saw the carrier may be turned on its centers and the rollers set up or down on a vertical are accordingly by the contact and pressure of the saw itself. This action will be understood by referring to Figs. 5, 6, and 7.

The stop i is a tube slotted at the front and filled with a packing of some suitable substance, such as a piece of tarred rope. It is fixed rigidly to the block M to stand in line with the space between the rollers, and is, with respect to the axes of the rollers, set a little out of the perpendicular to present one end in advance to meet the edge of the saw. In such position the pressure of the saw in running back against the step will tend to bring it up to the vertical, and this movement affecting the rollercarrier M will cause it to turn on its centers, the result of which will be to throw the rollers out of the horizontal. and set them diagonally across the face of the saw. The arms V are therefore required to yield at the points of attachment to the upright rod, and this movement is permitted by the arrangement of collars and sprin gs, as before described.

\Vhile the back of the saw is clear of the stop the rollers stand horizontally, and their plane of contact and rotation coincides with the vertical plane in which the saw travels; but as soon as the cutting-edge departs from a given line and runs back sutiiciently to bring the back edge up against the stop the rollers will be thrown up from the horizontal, and by virtue of their diagonal position during rotation will counteract this backward movement and throw the saw forward. Therefore, by setting the stop in this manner and placing springs on each side of thecollar U the adjustment of the rollers in a vertical arc is made automatic, and the saw readjusts it self when out of line. The true vertical position is also dictated to the sawyer by a pointer vibrating in front of a dial or graduated are, so that the saw can be kept up to its work by means of the hand-lever and connecting mechanism without making use of the automatic device, if so desired. In such case the collars U are fixed to the rod S by means of the set-screws U and the arms V are moved only as the rod S is moved by the hand-lever. This, however, necessarily calls for closer attention on the part of the sawyer, but is readily done while the machine is running. In applying this indicator I set a yielding finger Y on a shaft behind the saw in position to bear against the edge of the blade while the saw is at work, and connect to this shaft the end of a pivoted pointer Z in such manner that the rotary movement producech by the rise and fall of the finger will throw the pointer in an are from the center. This connection I have made by fixing a plate with an inclined slot or groove 3 on the shaft in front of the pointer and setting the extension of the pointer below the pivot into this slot. The construction and operation of this connection will be understood from Figs. 8, 9, and 10.

On the front of the bracket in Figs. at and 7 will be noticed a slotted plate P wit-h a thumb-screw P working through the slot and into the side of the arm V directly behind the plate. The office of this attachment is to hold the arm V while the bracket is being moved up or down in changing the height of the upper rollers from the lower set. In such adjustment it becomes necessary to loosen the collars U t t on the rod S, in order that the arm V may slide on the rod as the bracket is moved. At such time the adj ustingis more readily effected if the arms V are set and held in parallel position, and for this purpose the slotted plate and screw are applied, as before described. The plate is secured to the bracket H, and the slot in it is of suitable length to let he screw play loosely up and down in it when the end of the arm is attached to the rod S and the mechanism is at work.

In the operation of setting the bracket up or down both sets of rollers are placed so that arms V V are parallel, and then the screw P is tightened to fiX the top arm before the collars are loosened on the rod S.

The parts being constructed and combined in a machine as thus described, operate to perfectly guide and control the saw under the conditions of great speed at which such machines are run. The advantages incident to their use will be clear to those persons familiar with running and handling band-saws.

In an application filed by me on the 3d day of January, 1889, Serial No. 295,359, claims to the following features (which are shown in this application) are made, viz: a regulating attachment consisting of two rollers adapted to grip the saw-blade between them and capable of angular adjustment with respect to the plane in which thesaw-blade runs, whereby they can be set to rotate at an angle across the saw-blade,.in combination with means for setting and holding the rollers at different angles across the saw-blade, and the combination with a bandsaw, a pair of grippingrollers adapted to embrace and run with the saw-blade and mounted in a tilting frame or carrier which is capable of adjustment to change the angle of rotation of the rollers with respect to the plane in which the saw runs, and mechanism connected with said tilting carrier for setting it.at different angles of elevation and depression. I therefore do not make such claims herein.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a band sawing-machine, the combination, with two sets of laterally-adjustable deflecting-rollers, of rods m, by which the rollers are adjusted, and the upright rods R and S, connected to rods m, in the manner and for the purpose set forth.

2. In a band sawing-machine, the combination of the two sets of deflecting-rollers and pivoted carriers on which the rollers are mounted, said carriers being capable of being elevated or depressed in similar vertical arcs, rods m, connected to the carriers, and upright rods R and S, connected to the rods m, in the manner set forth, whereby the vertical movement of the carriers is produced and the sets of rollers are setsimultaneously and equally, as set forth.

3. In a band sawing-machine, the combination of deflecting-rollers, a sliding carrier on which they are mounted, rod on, connected to said carrier, and upright rod R, connected to rod m, in the manner and for the purpose set forth.

4. The combination of the pivoted and slidin g roller-carrier M, rod m, connected thereto, arm V, secured upon rod m and having the groove V and ,the uprightrod R, having a spline R working in groove V and the upright rod S, to which one end of the arm Vis connected, in the manner and for the purpose set forth.

5. The" combination of the pivoted rollercarriers M, rods m m, connected thereto, arms V V, secured upon rods m, rods S, to which the arms V V are connected at their opposite ends, and the screw-threaded sleeve T and fixed nut U on rod S, as a means for moving said rod, as set forth.

6. The combination of the sliding rollercarrier M, rod m, connected thereto, having a groove V in itor in a part fixed upon it, and the upright rod R, having a spline R working in the groove, as set forth.

7. The combination, with the pivoted rollercarriers M, of the rods m, connected thereto, arms V, secured upon rods m, the rod S, the yielding collars U", by which the arms V areconnected to the rod S, and the stop IT, against which the back of the saw works, as set forth.

8. The combination, with an endless bandsaw, of an indicator adapted to show the true Vertical position of the saw and to indicate the degree of its departure therefrom, consisting, essentially, of a pointer, a scale or dial, and a finger bearing against the saw and connected with the pointer to operate the same by 01' from the movement of the saw, as set forth.

9. The combination, with the roller-carriers M, rods m, connected thereto, arms V, secured [0 upon rods in, and rod S, to which the armsV are connected, of the clamp-screw and slotted plate P, through which the clamp-screw passes to the arms V, as and for the purpose set forth.

In testimony that I claim the foregoing I 15 have hereunto set my hand and seal.

ELIJAII S. GILMORE. [L. \Vitnesses:

CH AS. E. KELLY, .TosEPH E. FORD. 

